Rockford Fosgate P400X4 Punch 4-Channel Amplifier 50 Watts x 4 @ 4-Ohm 100 Watts x 4 @ 2-Ohm 200 Watts x 2 @ 4-Ohm Bridged Works with factory installed & aftermarket source units Onboard 12dB/octave LP/HP/AP crossover. NOTE: Use 40Hz @ 0dB (Track 5) for subwoofer amplifiers or 1kHz @ 0dB (Track 7) for full-range amplifiers. On-board Punch EQ with +18dB boost at 45Hz Cast Aluminum Heatsink with Stealth top mounted control panel